package com.spring.filter;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.spring.entity.SecurityUser;
import com.spring.entity.User;
import com.spring.security.TokenManager;
import com.springsecurity.utils.utils.R;
import com.springsecurity.utils.utils.ResponseUtil;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;
import org.springframework.security.web.util.matcher.AntPathRequestMatcher;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.ArrayList;

/** 认证过滤器 */
public class TokenLoginFilter extends UsernamePasswordAuthenticationFilter {

  private TokenManager tokenManager;
  private RedisTemplate redisTemplate;
  private AuthenticationManager authenticationManager;

  public TokenLoginFilter(
      AuthenticationManager authenticationManager,
      TokenManager tokenManager,
      RedisTemplate redisTemplate) {
    this.authenticationManager = authenticationManager;
    this.tokenManager = tokenManager;
    this.redisTemplate = redisTemplate;
    this.setPostOnly(false);
    this.setRequiresAuthenticationRequestMatcher(
        new AntPathRequestMatcher("/admin/acl/login", "POST"));
  }

  /** 1、获取表单提交用户名和密码 */
  @Override
  public Authentication attemptAuthentication(
      HttpServletRequest request, HttpServletResponse response) throws AuthenticationException {
    // 获取表单提交数据
    try {
      User user = new ObjectMapper().readValue(request.getInputStream(), User.class);
      return authenticationManager.authenticate(
          new UsernamePasswordAuthenticationToken(
              user.getUsername(), user.getPassword(), new ArrayList<>()));
    } catch (IOException e) {
      e.printStackTrace();
      throw new RuntimeException();
    }
  }

  /** 2、认证成功调用的方法 */
  @Override
  protected void successfulAuthentication(
      HttpServletRequest request,
      HttpServletResponse response,
      FilterChain chain,
      Authentication authResult)
      throws IOException, ServletException {
    // 认证成功，得到认证成功之后用户信息
    SecurityUser user = (SecurityUser) authResult.getPrincipal();
    // 根据用户名生成token
    String token = tokenManager.createToken(user.getCurrentUserInfo().getUsername());
    // 把用户名称和用户权限列表放到redis
    redisTemplate
        .opsForValue()
        .set(user.getCurrentUserInfo().getUsername(), user.getPermissionValueList());
    // 返回token
    ResponseUtil.out(response, R.ok().data("token", token));
  }

  /** 3、认证失败调用的方法 */
  protected void unsuccessfulAuthentication(
      HttpServletRequest request, HttpServletResponse response, AuthenticationException failed)
      throws IOException, ServletException {
    ResponseUtil.out(response, R.error());
  }
}
